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Access HP/COMPAQ's web-site, and click on "support" or "downloads". Enter the specific identifier (usually a sticker somewhere on the outside of your computer) that identifies the specific model that you have. Select the 'LAN' download.
Download it to a USB memory-stick.
Connect the memory-stick to your computer, and install the driver.

Pls reconnect the Ethernet cable back to the other PC and check how is its getting IP address, automatic (Obtain an IP...) or fix (Use the following...). To do this go to your Control Panel, click on Network Connections, right click on Local Area Connection, click on Properties, highlight Internet Protocol (TCP/IP), click on Properties button. If it is the latter, note down the numbers.

Plug the Ethernet back to your laptop and do the same. Set your laptop's Internet Protocol Properties to mimic the other computer settings. The only possible difference would be is if the other computer is ticked on "Use the....", the IP address of the laptop should be different from the other PC. Example if the other PC is 192.168.1.5, make the laptop 192.168.1.6. All others stay the same.

Hope this ne of help/idea. Pls post back how things turned up or should you need additional information.

for windows xp if you want networking between your computers attach your computers with cross cable and right click on my computer for system properites > there you will see computer name tab > there you will see network id button > click on it and run the installation on all the computers you want to be in network....-------------------------------------------Please let me know your feed-back.